So I currently use Thunderbird with Lightning and have imported several ICS files there on my Windows system (more details on how I did this here). This works great. But for Android there does not seem to be a simple app for this.
To sum up: overall I already have Dropbox for syncing. So I would just need a app that let me choose the ICS files and let me use it just like in Thunderbird. I already tested 20 apps. None was able to do my task so far.
I also don't need just an import app for ICS files. Because then the Dropbox wouldn't sync anymore for sure and I would have trouble on my Windows system. So just an editor that accesses ICS files would be perfect. As I have currently 7 ICS files, it would be great if the app would show them together like Thunderbird does.
By the way I already tried to open an ICS file with the Android Calendar app and it actually showed me an event. But I was not able to show all and the behaviour was very strange.
Update from the comments
- I found ICSDroid which allowed me to add ICS files from Dropbox correctly
- these Calendars where correctly added to the Calendar system
- the problem is that they are not added to "My Calendars", instead they are added to an external list, which is read-only!
- also the Sync is kind of broken on these calendars, updates in thunderbird are not shown on my Android calendar apps (I tried the normal, aCalendar, Planner Plus)